TSM1121
3.3V 5V 12V HOUSEKEEPING IC
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Over voltage protection for 3.3V 5V and
12V without external components
Under voltage protection for 3.3V 5V and
12V without external components
Over voltage protection for -12V or -5V with
external components
Externally adjustable under voltage
blanking during power up
Power good input/output
Externally adjustable pg delay
Fault output
Remote output
Externally adjustable remote delay
Precision voltage reference
2kV ESD protection
N
DIP14
(Plastic Package)
D
SO14
(Plastic Micropackage)
PIN CONNECTIONS
(top view)
DESCRIPTION
The TSM1121 integrated circuit incorporates all
sensing circuitry to regulate and protect from over
voltage and under voltage a multiple output power
supply (3.3V, 5V and 12V).
TSM1121 incorporates all the necessary functions
for Housekeeping features which allow safe
operation in all conditions, and very high system
integration.
TSM1121 integrates a precise voltage reference.
VS33
VS5
VS12
EP
PI
1
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
FAULT
PG
TPG
TREM
REM
VREF
APPLICATION
s
PC SMPS triple power line housekeeping ic
(3.3V 5V 12V)
TUV
GND
ORDER CODE
Part
Number
TSM1121CN
TSM1121CD
Temperatur
e Range
0 to 85°C
0 to 85°C
Package
Marking
N
•
•
D
TSM1121C
M1121
Note:
N =
Dual in Line Package (DIP)
D =
Small Outline Package (SO) - also available in Tape &
Reel (DT)
May 2003
Revision A
1/11
TSM1121
1
PIN DESCRIPTION
Name
Vcc
Gnd
Vs12
Vs5
Vs33
Tuv
Fault
PI
PG
Tpg
REM
Trem
Vref
EP
Pin Description
Pin #
14
7
3
2
1
6
13
5
12
11
9
10
8
4
Type
Power Supply
Power Supply
Analog Input
Analog Input
Analog Input
Timing Capacitor
Open Collector
Analog Input
Open Collector
Timing Capacitor
Logic Input
Function
Positive Power Supply Line
Ground Line. 0V Reference For All Voltages
Over and Under voltage Sense Input Dedicated to the 12V Line
1
Over and Under voltage Sense Input Dedicated to the 5V Line
1)
Over and Under voltage Sense Input Dedicated to the 3.3V Line
1)
Adjustable Under voltage Blanking Delay at Power Up (Setting Capacitor)
Fault Output. Fault is high when Over or Under Voltage has been Detected
Power Good Input. Detection of the Power Conditions
Power Good Output. PG output is High when the Power Conditions are
OK
Adjustable Power Good Delay (Setting Capacitor)
Input Remote Control of the Complete System by the Motherboard (µCon-
troller). Remote is active high. Switch OFF/ON of the Power Supply. Reset
of the Complete System after a FAULT Activation.
Adjustable Remote Delay (Setting Capacitor).
2.5V Reference for all Voltages
Extra Protection Circuit. Can be used for -12V or -5V Over Voltage Protec-
tion.
Timing Capacitor
Voltage Reference
Analog Input
1) Over and Under Voltage Inputs can go higher than Vcc within the allowed Max Rating range
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Iout
Io
VFault
Pd
Tstg
ESD
Tuv
EP
PI
PG
Tpg
REM
Trem
DC Supply Voltage
DC Supply Voltage
1
Output Current Power Good
Output current for the Voltage reference
Fault Ouput
Power Dissipation
Storage Temperature
Electrostatic Discharge
Adjustable Under voltage Blanking At Power UP
Extra Protection
Power Good Input
Power Good Output
Adjustable Power Good Delay
Remote Control
Adjustable Remote Delay
Value
25
30
20
5
0.7
-55 to 150
2
5
5
5
5
5
5
5
Unit
V
mA
mA
V
W
°C
kV
V
V
V
V
V
V
V
1) All voltage values, except differential voltage are with respect to network ground terminal.
OPERATING CONDITIONS
Symbol
Vcc
Toper
Parameter
DC Supply Conditions
Operating Free Air Temperature Range
Value
4.5 to 24
0 to 85
Unit
V
°C
2/11
Electrical Characteristics
2
ELECTRICAL CHARACTERISTICS
Parameter
Total Supply Current
Over Voltage and Under Voltage Protection
Over Voltage Sense 3.3V
Input can go higher than
3.8
Vcc
Over Voltage Sense 5V
Input can go higher than
5.8
Vcc
Over Voltage Sense12V
Input can go higher than
13.4
Vcc
Under Voltage Sense 3.3V
2.1
Under Voltage Sense 5V
3.7
Under Voltage Sense 12V
9.2
Extra Over voltage Protection Threshold
Fault Delay Before Latching
Internally Fixed Delay
Under Voltage Blanking During Power
Up (Vcc rising)
Blanking Threshold
Cuv = 2.2µF
Adjustable Blanking
TSM1121
Tamb = 25°C and Vcc = 17V (unless otherwise specified)
Symbol
Icc
Vov33
Vov5
Vov12
Vuv33
Vuv5
Vuv12
Vep
Tfault
Test Condition
Min
Typ
3
4
6.1
14.2
2.3
4
10
1.28
100
Max
5
4.2
6.4
15
2.5
4.3
10.8
Unit
mA
V
V
V
V
V
V
V
µs
Total Current Consumption
Under Voltage Blanking During Power Up
Tuv
Thuv
Vpgth
100
300
1.28
1.28
70
Collector Current = 15mA
PG Output = 5V
Load Capacitor = 100pF
Load Capacitor = 100pF
Load Capacitor Cpg=2.2µF
1
1
300
1.28
1
1
0.4
1
500
ms
V
V
mV
V
µA
µs
µs
ms
V
V
µA
Power Good (PG)
Power Good Voltage Threshold
Power Good Voltage Threshold Hyster-
Vpghyst
esis
Low Output Open Collector Saturation
Vpgol
Voltage
High Output Open Collector Leakage
Ipgoh
Current
Tpgr
Power Good Output Rise Time
Tpgf
Power Good Output Fall Time
Tpg
Power Good Adjustable Delay
PIth
Power Input Detection Threshold
100
500
Fault
Vfaultol
Ifaultoh
Fault Output Saturation Voltage Level
Fault Output Leakage Current Level
IFault = 1mA
Vfault = 5V
Remote Control (REM)
Vremth
Vremih
Iremil
Trem1
Trem2
Remote ON/OFF Input Voltage Thresh-
old
High Input Remote Voltage
Low Input Remote Saturation Current
Remote Adjustable Delay ON to OFF
Load Capacitor
Crem=0.1µF
Remote Adjustable Delay OFF to ON
Load Capacitor
Crem=0.1µF
Internal Voltage Reference
Line regulation
Line regulation
Io = 0mA
Io = 0mA
4.5V<Vcc<24V
Io = 10mA
4.5V<Vcc<24V
0<Io<10mA
0.7
3.3
40
40
0.8
3.4
0.5
50
50
60
60
1
V
V
mA
ms
ms
Voltage Reference
Vref
Regline
Regline
2.46
2.5
4
15
25
2.54
10
V
mV
mV
mV
Regload Load regulation
1
1) Do not short circuit the Vref Pin
3/11
TSM1121
Fig. 1: Application Schematic
12V
5V
3.3V
Electrical Characteristics
12V
5V
3.3V
~
PRIMARY
RECT.
MAIN
CONV.
PWM + OPTO
+ Vref
AUX.
CONV.
Vcc
5Vstby
5Vstby
PWM + OPTO
+ Vref
TSM1121
Over & Undervoltage Protection
FAULT
Reference
Logic
Sequencer
PG
REM
Fig. 2: Internal Schematic
Vcc
TO
POWER
SUPPLY
OUTPUT
12V
5V
3.3V
Vs12
Vs5
Vs33
OVP
UVP
TSM1121
LOGIC
SECONDARY
HOUSEKEEPING
PI
PG
FAULT
REM
Trem
Tpg
Ep
12V
FROM
MAIN
CONV.
Gnd
5V
3.3V
Vref
Vref
UV
BLANK
Tuv
4/11
to MOTHERBOARD
Electrical Characteristics
Fig. 3: Detailed Internal Schematic
TSM1121
Vcc
VS12
3
Vov12
Vref
14
1k
FAULT
13
OVP
Tfault
S
R
UVP
Q
3.47V
1.28V
Tuv
6
Cuv
Vuv12
VS5
2
Vov5
Trem
Vref
Trem
10
3.47V
Crem
Rem
9
Pg
12
Vuv5
VS33
1
Vov33
Vref
0.8V
1.28V
3.47V
Vuv33
EP
4
1.25V
Vref
8
1.28V
VREF
VovEP
Tpg
11
Cpg
TSM1121
Gnd
7
PI
5
5/11
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